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12/20-21 Clipper/Coastal Nowcast and Obs


Boston Bulldog
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A big reason we didn’t get a widespread 6-12 like the NAM this morning said was snow ratios. Those snow maps assume 10:1 ratios, I went outside and was able to successfully make a snowball. That’s when I realized there wasn’t any real shot I break 6 inches. If you can successfully make a snowball, the snow ratios are 6:1 at most, often even lower. Still a good event though, probably going to end up with 3-4 inches when the storm is done. That’s a hell of a lot better than the dusting I expected.

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2 minutes ago, SJonesWX said:

surprise up here. Roads got slick quickly and for the most part people were driving in control, which is somewhat unusual. of course the grannies were driving 30 under the speed limit but better than smashing into me I guess

I noticed the same thing on Route 33 out my way.  Kinda weird.  Nobody getting too crazy.  Except for that Subaru behind me - Dude!  Give at least a couple car lengths!  

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The last time it snowed on Christmas in Boston was in 2017, when the city got 2.9 inches. But that snow didn't start until about 7 AM. The last Christmas here with 1" or more of snow on the ground entering the day was in 2009. So it's been a while, but we might be good this year.  But don't use the airport measurement as your guide.

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